---
title: "CVE-2019-14463\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2019-14463?format=md
keywords: index, follow
---

# CVE-2019-14463

Publication date 31 July 2019

Last updated 25 August 2025

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**9.1 · Critical**

[Score breakdown](https://ubuntu.com/security/CVE-2019-14463?format=md#impact-score)

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## Description

An issue was discovered in libmodbus before 3.0.7 and 3.1.x before 3.1.5.
There is an out-of-bounds read for the MODBUS\_FC\_WRITE\_MULTIPLE\_REGISTERS
case, aka VD-1301.

### From the Ubuntu Security Team

It was discovered that libmodbus incorrectly handled inputs. An attacker could
possibly use this issue to cause a denial of service or other unspecified
impact.

[Read the notes from the security team](https://ubuntu.com/security/CVE-2019-14463?format=md#notes)

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| libmodbus | 22.04 LTS jammy | Not affected |
| 21.10 impish | Not affected |
| 21.04 hirsute | Not affected |
| 20.10 groovy | Not affected |
| 20.04 LTS focal | Not affected |
| 19.10 eoan | Not affected |
| 19.04 disco | Ignored end of life |
| 18.04 LTS bionic | Fixed 3.0.6-2+deb9u1build0.18.04.1 |
| 16.04 LTS xenial | Fixed 3.0.6-1ubuntu0.1~esm1  Ubuntu Pro |
| 14.04 LTS trusty | Fixed 3.0.5-1ubuntu0.1~esm1  Ubuntu Pro |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)
* [Patch details](https://ubuntu.com/security/CVE-2019-14463?format=md#patch-details)

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## Notes

---

### [ebarretto](https://launchpad.net/~ebarretto)

Commit introduces regression, check if both commits are being applied.

### Patch details

For informational purposes only. We recommend not to cherry-pick updates. [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)

| Package | Patch details |
| --- | --- |
| libmodbus | * Upstream:   [5ccdf5e](https://github.com/stephane/libmodbus/commit/5ccdf5ef79d742640355d1132fa9e2abc7fbaefc) * Upstream:   [ca3fcb1](https://github.com/stephane/libmodbus/commit/ca3fcb1c98755e8f44c33a910af4db3c799ee63e) * Upstream:   [6f915d4](https://github.com/stephane/libmodbus/commit/6f915d4215c06be3c719761423d9b5e8aa3cb820) * Upstream:   [2b5cb58](https://github.com/stephane/libmodbus/commit/2b5cb5896120d7564f4c34fdc5aaa4f22a97e45c) * Upstream:   [64cd092](https://github.com/stephane/libmodbus/commit/64cd092bcc421a70431fe1fb6b7f1e6f491f7cf8) |

## Severity score breakdown

CVSS version:
CVSS v3.0

**Base score**

9.1 · Critical

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Privileges required | None |
  | User interaction | None |
  | Scope | Unchanged |
  | Confidentiality impact | High |
  | Integrity impact | None |
  | Availability impact | High |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 9.1 · Critical |
  | Exploitability score | - |
  | Impact score | - |

**Vector:** CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14463)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2019-14463)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2019-14463)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2019-14463)

### Related Ubuntu Security Notices (USN)

+ [USN-5173-1](https://usn.ubuntu.com/USN-5173-1)
+ libmodbus vulnerabilities
+ 6 December 2021

+ [USN-5173-2](https://usn.ubuntu.com/USN-5173-2)
+ libmodbus vulnerabilities
+ 9 December 2021

### Other references

* <https://github.com/stephane/libmodbus/commit/5ccdf5ef79d742640355d1132fa9e2abc7fbaefc>
* <https://libmodbus.org/2019/stable-and-development-releases/>
* <https://www.cve.org/CVERecord?id=CVE-2019-14463>